Feeding mechanism for sewing-machines



T. I. HAYES.

FEEDING MECHANISM FOR SEWING MACHINES.

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FEEDING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED mm. m7.

1 ,388, 1 83. Patenfod Aug. 23, 1921.

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v Inventor. q Thornt lsLlHu es T. l. HAYES.

FEEDING MECHANISM FOR SEWING MACHINES. APPLICATION FILED m4.4.1911.

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Patented Au 23,1921.

T. l. HAYES.

FEEDING MECHANISM FOR SEWING-MACHINES.

APPLICATION FILED JAN- 4. 19 11- 1,388,183. Patented Aug. 23,1921.

4 SHEETS-SHEET 4.

\nvenTor. Thomas J. Hayes byifimdwtw Aflys.

UNITED-STATES PATENT OFFICE.

THOMAS J. HAYES, OF ROSLINDALE, MASSACHUSETTS, ASSIGNOR TO ARBETTER FELLING MACHINE COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MAINE.

FEEDING MECHANISM FOR SEWING-MACHINES.

Application filed January 4, 1917. Serial No. 140,522.

-T all whom it may concern:

Be it known that I, THOMAS J. HAYES, a citizen of the United States, and resident of Roslindale, county of Suffolk, State of Massacliusetts, have invented an Improvement in Feeding Mechanism for Sewing-Machines, of which the following description, in connection with the accompanying drawing, is a'specification, like characters on the drawing representing like parts.

This invention relates to improvements in feeding mechanisms for sewing machines and the general object thereof is to provide a novel feed dog actuating mechanism which will be simple in construction and effective in operation and in which the feeding mechanism will be capable of movement toward and from the stitch forming mechanism.

-This is accomplished in the preferredconstruction illustrated herein by mounting the feed dog upon one or preferably two rock shafts which are supported at the opposite end in pivotally mounted journals so that thefeed dog and its actuating mechanism maybe moved in an arc toward and from the stitch forming mechanism.

More particularly the object of the invention is to provide a feeding mechanism for sewing machines having special accessories cooperating with the stitch forming mecha nism, such as bender mechanisms, looper mechanisms and the like, the feeding mechanism being so constructed as to provide ample room for said accessories and their actuating mechanisms.

Another feature of the invention consists in providing a head containing a single vertical shaft, journaledin the usual standard of a blind stitch sewing machine, for actuating the bender shaft and bender and also a rock shaft which serves to impart up and down work engaging and releasing movements to the feed dog so that the proper timing of the bender and feed dog will be maintained.

Another feature of the invention consists in utilizing one or more hollow rock shafts for actuating the feeding mechanism and providing said rock shafts with lubricant reservoirs within the bearings in which they are journaled.

Other features of the invention will more fully appear from the following description and accompanying drawings and will be particularly indicated in the annexed claims.

In the drawings; I I Figure 1 is a side elevation of a blind stitch sewing machine of the Arbetter type,

a portion of the bed plate and standard bein" shown in section,

Fig. 2 is a bottom plan view ofthe sewing machine illustrated in Fig. 1 showing the feeding mechanism and illustrating the mechanism for driving the bender shaft, the

latter being broken away,

Fig. 3 is a front end elevation of the sewing machine illustrated in Fig. 1,

Fig. 4 is a rearend elevation, the standard being shown in vertical section, V i

Fig, 5.is an enlargedldetail View of the work support, the feed dog and the means for actuating the same,

.Fig. 6 is a detailvertical sectional view of one of the rock shafts for actuating the feed dog and of the bearings forming a part of the work support in which it isjournaled' F ig. 7 is a detail planview of the feed dog. The sewing machine which embodies the present invention may be of the type illustrated in my prior application Ser. N o.

. Specification of Letters Patent. Patented ring. 23, 1921.

108,279, filed Jul 10. 1916 and which is ad dressed to a. bender mechanism, the present feeding mechanism being designedto be used with the. bender mechanism disclosed in that application.

The sewing machine illustrated herein is of the AI-better type having a bed plate 1 preferably provided with an upwardly pl'O- jecting boss 2 forming abase for a standard which carries the usual overhanglng arm 4,

terminating in ahead 5 which supports a curved oscillating needle and complemental stitch forming mechanism. A main shaft 6 is journaled in suitable bearings in the'arm and standard, the bearing in the standard preferably comprising a boss 8 having a bushing 9 surrounding the shaft.

The main sh'aft 6 isrotated by'a pulley 10 having a hand wheel 11. which may be connected with the shaft in the usual manner but preferably is provided with a novel con nection hereinafter to be described.

The shaft 6 is provided at its opposite end with suitable means for actuating the needle and complemental stitch forming 'mechanism which may be of any desired type but preferably is similar to that disclosed in my prior application aforesaid.

The head of the machine is provided with a depending hook bracket 12 to which a presser foot 13 is secured. The feeding mechanism is adapted to cooperate with the presser foot and preferably is carried by a work supporting memberwhichis yieldably and adjustably supported by said bed plate .vided at its ends with extensions 16, 17. 18

and 19 terminating respectively in bosses 20, 21, 22 and 23 which form journals for the ends of the rockshafts which serve to operate the feed dog, as will hereinafter .under surface of the bed plate.

more fully appear. The work supporting member is also provided with projecting members 24, 25 and 26 which extend toward the end of the machine, the members 24 and 26 having secured thereto downwardly depending arcuate guides 27, 28 which are provided with longitudinal slots 29 (see Fig. 1). The guides 27 and 28 slidably engagethe outer walls 30, 31 of a bracket32 which is secured to and depends from the This bracket is provided at its lower end with a transverse-web 33 having a central screw threaded aperture in which a screw 34 hav ing a hollow stem is seated.

A helical spring 35 mounted at its lower end upon the upper end of the screw 34 encircling a guiding rod 36 engages at its up per end the extension 25 of the work supporting member and normally malintains the work support in engagement with the presser foot 13. By the adjustment of the screw 34 the pressure of the work support against the presser foot may be regulated in the well known manner.

The guides 27, 28 may conveniently be secured in proper relation to the outer walls 30, 31 of the bracket by bolts 37 anchored in the walls 30, 31 of the bracket and extending'through the slots 29in the armate guides 27, 28, suitable washers 38 overlying said slots to permit slidingmovement between. the guides and the walls of the bracket.

The feed dog 39 preferably is of rectangw lar form andis provided witha plurality of serrated work engaging members adapted toextend through the usual slots in the upper surface of the work supporting cap 15.

The dog 39 is provided with downward and V by lateral extensions-40, 41 which are secured screws 42, 43 to portions 44, v45 of a feed bar which has a central portion 46 01fset to provide room for the bender and its operating mechanism. 2

The feed dog and feed bar as thus constructed form in eifect'an integral structure which hereinafter will be referredfito generally as the feed dog. i i

The end portions 44, 45 are connected respectively to mechanismsadapted respectively to give the feed bar and feed dog an up and down work engagingand releasing movement and an advancing and retracting movement. The mechanism for producing these movements, illustrated in the preferi.'ecl forni of the invention disclosed herein, comprises rock shafts 47, 48 which preferably are tubular in form and are provided with arms connected to theends of said feed bar and operated by suitable mechanisms hereinafter to be described.

The rock shaft 47 which is adapted to impart up and down or work engaging and releasing movement to the feed dog is journaled in bearings 20, 21 in the extensions of the work supporting member and is provided with an arm 49 having a stud 50 carrying a cross head 51mounted in a slot 52 in the portion 44 of the feed bar. The shaft r 47 is mounted at its opposite end in a bear- .of the machine and is provided at its upper end with a beveled gear 61 which meshes with a driving gear 62 fast upon the main shaft 6.

The opposite end 45 of the feed bar is pivotally mounted on a stud63 extending lat orally from an arm 6-4 upon the rock shaft 48. The rock shaft 48 is journaled. at its outer end in the bearings 22, 23 of the work supporting member and is journaled at its opposite end in a bearing 65 which, like the bearing 53, is provided with an upwardly extending car 66 pivotally mounted upon the transverse shaft 55. The rock shaft 48 is also provided with an arm 67 which is escillated by a link 68 through suitable mech w anism.

A preferred means for osnllating the arm. 67 comprises a lever 69 fulcrumed upon a stud 70 which projectsfrom the end of a" link 71 which is provided at its opposite end with a boss 72 which is pivotally mounted upon a stud 73 in the end of one arm 74 of a bell crank lever which is pivotally mounted.

- upon a stud75 extending into the wall of the standard. The other arm 76 of the Rbell crank lever is provided with-a screw 77 V end-ofthelink 69 is pivotall'yconnected to a stud 80 upon the end of an arm 81 of a bell 83 depending from the under surface of'the" bed plate.

cranklever which is pivotally mounted upon a stud 82 projecting laterally from a bracket The other arm 84 of said bell crank carries a ball-stud 85' to which the end of the link 68 is pivotally connected.

- "At its upper end the lever 69 is bifurcated to form parallel arms 86, 87 which-engage a cam 88 secured upon the main shaft within thestandard.

' By reason-ofthe construction aforesaid the rotation of the cam oscillates the forked end of the standard about its fulcrum 70.

was

This fulcrum however being upon the end of a linkTlfin turn oscillates about its pivotal stud 73 which projects from the end of the lever, the fulcrum 70 of the lever will oscillate equally upon either side of the plane "of the axis of the lever but when the stud 73 is moved to the sideof'the plane-of the axis of the lever 67 a longitudinal movement will be imparted to the 'lever by reason of th'e ar'cuate mov'ement of the fulcrum 70 at the end "of the link 71. The longitudinal "movement of the lever 69 serves to oscillate the arm 81 of the bell crank lever the other 2l1 fI Il 84 O'f which is connected by the link 68 to the arm 67of the rock shaft 48. This construction affords a very accurate and sensitive adjustment for regulating the amplitudeot oscillation of the rock shaft 48 and consequently the extent of movement of the feed dog.

The feed bar and feed dog are carried' di- *r'ectly upon the arms of the rock shafts and therock shafts in t'urn'are supported at their "outer ends infthe hearings in the extension of the work supporting member so that the presenting the work to the stitch forming fwoi'k supporting member and the feed dog.

are movable in unison toward and from the 'stitch forming mechanism, consequently a proper relation between them is at all times maintained and their proper cooperation in mechanism insured.

[length and their ends which engage respec- B'y-reasonof the fact that the universally pivoted links 57 and 68 are of a constant 'tivelythe arms 56 and 67 ofthe rockshafts 47 and/18 adapted to swingin the arc of the circle, the depression of the'work support'by tical shaft 60.

engagement with thicker material will cause a slight rocking movement of the shafts 47 and 48 which will thrust the Y feed dog slightly farther through the work plate and advantageously force it a little deeper into thicker goods. I 1

While in the preferred embodiment of the invention disclosed herein thework support carries the ends of bothshafts for actuating the feed dog it will be obvious that a single rock shaft may be used for imparting one of themovements of the feed dogwhile other mechanism usual in the art maybe em ployed for imparting the other necessary movement to said dog. r I V In order further to maintain the proper coordination between the elements of the work presenting mechanism means are provided whereby the bender is actuated from thesame shaft as that which causes the up and down work engaging and releasing movement of the feed dog. This is very important since the timing of the reciprocation of the bender relatively to the feed dog must be accuratein order that the bender may be withdrawn from the work out of the path of the feed dog to avoid interference with the advancing movement of said dog;

This is accomplished in the preferred embodiment of the invention shown herein by actuating the bender mechanism from a "shaft 89 suitably journaled in the bearings depending from the under surface of the bed plate and provided with a spiral gear 90 whi h engages aspiral gear'59 upon thever- As a result of the construction described the work support and feed dog and'also the bender oscillate about pivots located beneath the standard of the machine. the radius of oscillation being of sufficient length to cause the work supportv and its feed dog and the bender to move substantially vertically.

Any suitable means may be provided for depressing the work support to permit the insertion and removal of the'work. In the preferred construction illustrated herein a flexible'connection such as a cord or chain 921s secured to the projection 25 upon the work supporting'member and is carried beneath 1a pulley'i93 suitably' journaled in bosses 94 projecting laterally from the standard 32, the opposite end of saidcord being connected to an arm 95 of a shaft 96 whichis journaled in suitable bosses 9'7. 98 depending from the bed plate and is operated by an arm 99 which is'connected to the usual knee leverQ v V A. further feature of the invention consists in utilizing a portion of-the hollow interiorof the end of each rock shaft as a reservoir for lubricant for the inclosing bearings.

This construction is illustrated in Fig. 6 in i which the hollow rock'sha'ft 47 is shown as journaled in the bearings 20, 21, the feed dog engaging arm 49 being interposed be twee-nthe bearings 20 and 21. A partition, which maybe a plug 100, is inserted in the tubular rock, shaft just beyond the end of the bearing20' andithe other endof the 1101- low rock shaft 47 is closed up by a plug 101.

Y screwed into the end of the rock shaft. The

plug 101 desirably is'providedwith a central oil duct 102 through lwhich the lubri cant may be introduced into the reservoir 103 thus formed. Ducts 104. and 105 lead respectively from the reservoir to the bearings and 21. The reservoir thus con-.

structed is. of sufficient capacity tocontain enough lubricant to supply the bearings for a'considerable period of time'so that the usual necessity of frequently oiling the bearings is obviated. Furthermore both ends of each of the shafts which are thus equipped hub of the gear 62 and the end of the bush-q are exposed so that the reservoirs can easily be replenished.

In the operation of sewing machines it is I often desirable to disconnect the pulley fromits operative relation to the main shaft in order to provide for the Winding of the bobbins and for otherpurposesI It is also.

desirable to provide means for adjusting the main shaft longitudinally to take up wear between the bearings and the mechanisms which actuate the stitch forming mechanism and the feeding mechanism, suchforexample as that which may occur between the ing9. This is accomplished in the mechanism illustrated herein by mounting the pulley 10 upon a sleeve which abuts against the end of the boss 8 and through which the shaft 6 is longitudinally adjustable As illustrated in the accompanyingdrawings a sleeve 106 is provided with a flange 107 which abuts against the end of the boss -8 and its bushing 9, the outer end of the sleeve extending a short distance beyond the end of the shaft 6.

construction also obviates the necessity of careful machining of certain ofthe parts and thus aids in assembling.

The pulley 10 is rotatably mounted upon the'sleeve 106 and a nut 112 provided with a milled hand grip 113 screwed upon the end of the sleeve serves to clamp the hub of the.

pulley 10 against the flange 107 when it is desired to actuate the main shaft: When the.

nut 112 is backed off the pulley 10 is released and rotates freely upon the sleeve 106 and maybe used for winding bobbins, etc,

scope of the following claims.

ters Patent is without actuating the machine. vThe nut 112 is held from coming off by contacting with the inner face of the enlarged head 109 of the screw 108.

' Another novel feature of the sewing ma- .chine illustrated herein comprises mecha nism for regulating the take up. The take up arm 114 is provided at its end with a boss 115 transversely apertured to receive a sliding bar or shaft 116 which'is secured to a stud 117 projecting from-an arm 118 which desirably is connected to and rotates about theaxis of the main shaft. The boss 115 is provided with a laterally extending stud 119 which is eccentrically seated in a bushing 120 which is rotarily adjustable in the "sewing machine head, the axis of said bushing preferably being upon the same horizontal plane as the axis of the main driving; shaft.

In operation the rotary movement of the stud 117 oscillates and reciprocates the slide bar 116 and thereby imparts an oscillatory movement to the take-up arm 11 1 about the center of the stud 119. By rotarily adjusting the bushing 120 the axis of the stud 119 may be moved toward and from the axis of the main driving shaft thereby increasing or decreasing the distancebetween the "axes of the studs 117 and 119 and consequently varying the extent of movement of the take up" arm. This adjustment also regulates its timing relatively to the hook as the axis'of the studis. raised or lowered relatively to the horizontal plane of the axis of the main I shaft. V I

It will be understood that the particular mechanism disclosed herein-is ofan illus tions may be made within the spirit and Having thus described my inventiomwhat I claim as new and desire to secureby Let- 1. In a sewing machine comprising a stationary bed plate, an overhanging arm and stitch forming mechanism carried thereby, feeding mechanism including a pair of rock shafts, means for yieldably supporting the same at one end relatively to thestitch forming mechanism and said bed plate, means for pivotally supporting said shafts ,at the opposite end, a feed dog, operating through an aperture in said bed plate, :means for supporting said feed dog from said rock shafts and means for oscillating said rock shafts to.

actuate said feed dog.

.2. In a'sewing machine comprising a bed plate, anaoiverhanging arm and stitch forming mechanism carried thereby, feeding mechanism including a rock shaft pivotally.

mounted at one end and movable at. its opposite end relatively to said bed plate, means for oscillating said rock shaft, a feed dog operatingthrough an aperture in said bed plate, means connecting saidfeed dog t trative character and that various modificasaid rock shaft-to cause the oscillation of the .rockshaft to; advance and retract said feed dog and means for imparting an up and down work engaging and releasing movement to said feed dog.

3. In a sewing machine comprising'a bed plate, an overhanging arm and stitch forming mechanism carried thereby, feeding mechanism including a rock shaft pivotally' rock shaft'to advance and retract said feed.

dog and means for adjusting the amplitude of movement of said feed dog.

t. In a sewing machine comprising a bed plate, an overhanging arm and stitch. forming mechanism carried thereby, feeding mechanism:including a rock shaft pivotally mounted at one end and movable at its oppositeend relatively tosaid bed plate, means for oscillating said rock shaft, a feed dog operating through an aperture in said bed plate, means connecting said feed dog to saidv rock shaft to cause the oscillation of 'the rock shaft to impart an up and down work engaging and releasing movement to said feed dog and means for advancing and member- 1s movable relatively to said bed retracting said feed dog.

In a sewing machine comprising a bed plate, an overhanging arm and stitch formin mechanism carried thereby, a work supporting member, means for yieldably supporting the same from said bed plate, a rock shaft, means for supporting one end of .the same in said-work supporting member, means for pivotally supporting the opposite end of said rock shaft, a feed dog reciprocably mounted in said work supporting member, meansoperable by the oscillation of said rock shaft to advance and retract said feed dog and means for imparting an up and down work engaging and releasing movement to said feed dog. I

6. Ina sewing machine comprising a bed plate, an overhanging arm and stitch forming mechanism carried thereby, a Work supporting member, means for yieldably supporting the same from said bed plate, a rock shaft, means for supporting one end of the same in said work supporting member, means I for pivotally supporting the opposite end of said rock shaft, afeed dog reciprooably mounted in said work supporting member, means operable by the oscillation of said rock shaft. to impart up and down work engaging and releasing movement to said feed dog and means said feed dog;

7. In a blind stitch sewing machine comprising a stationary bed plate, a curved OS- cillatingneedle, complemental stitch formfor advancing and retracting ing mechanism and apresser foot located above said bed plate, a work supporting member, and means for supporting the same incooperative relation to said presser foot;-

parallel rock shafts .journaled at one end in said work supporting member, means for pivotally supporting the opposite end of.

said rock shafts'to permit movement of said work supporting member relatively to said bed plate, a feed dog operating through an aperture insaid bed plate, means connecting the respective ends of the feed dog to said rock shafts whereby the oscillation of one rock shaft will impart up and down cloth engaging and releasing movement to said feed dog and the oscillation of the other rock shaft will advance and retract said dog. 7

8. In a blind stitch sewing machine comprising a stationary bed plate, a standard having an overhanging arm,-Z a curved oscillating needle, complemental stitch forming mechanism and a presser foot carried by said arm, a work supporting member, means for yieldably supporting the-same in cooperative relation to said presser foot; parallel rock shafts journaled at one end in said work supporting member, journalsjfor the opposite ends of said rock shafts pivotally mounted upon a shaft extending transversely across the bed plate beneath. the standard whereby said work supporting plate and said presser foot, 2. feed dog operating through an aperture in said bed plate, means connecting one of said rock shafts to said feed dog to. cause the oscillation ofthe rock shaft to impart up and down clothengaging and releasing movements to said feed dog and means connecting the other rock shaft to said feed dog to cause the os-'- cillation of the latter to advance retract said feed dog.

9. In aiblind stitch sewingmachine prising a bed plate, a standard rising therefrom, an arm having a head, a main shaft journaled in said-arm and head, acurved oscillating needle, complementary stitch forming mechanism. and. a presser foot carried by said head; a bracket depending from said bed plate, a work supporting member having dependingguides slidably mounted upon said bracket and provided withlaterally extending journals, yieldable means on 7 said bracket supporting said work supporting member, rock shafts mounted'at one end in said journals,jjournalsfor the opposite ends of said shaft pivotally mounted in said bed plate beneath said standard, a feed dog, earned by said shafts and means forcausing the oscillation of one of said rock shafts to impart up and down cloth engaging and releasing movements .to 'said dog and the oscillation of the other rock shaft to advance and retract said dog. I i I 10. In a blind. stitch sewing machine com-.

prising a bed plate, a standard rising therefrom, an 'arm having a head, a'main shaft journaled in said arm and head, a curved oscillating needle, complementary stitch forming mechanism and a presser foot car ried by said head, a bracket depending from said bed plate, a work supporting member having depending guides slidably mounted upon said bracket and provided with laterally extending journals, yieldable means on said bracket supporting said work support ing member, rock shafts mounted at one end in said-journals, journals for the opposite ends of said shaft pivotally mounted in said bed plate beneath said standard, a feed dog,

an arm on one of said rock shafts slidably connected to one end of said feed dog, an arm upon the other rock shaft pivotally connected to the opposite end of said feed dog andmeans for oscillating said rock shafts whereby the oscillation of the first mentioned rock shaft will impart up and down cloth engaging and releasing movements to said feed dog and the oscillation of the other rock shaft will advance and retract 'cillated to impart up and down cloth engaging and releasing, movements to said feed dog, means for advancing and retracting said feed dog, a bender actuating shaft lo'- cated beneath said bed plate and means'operable from said vertical shaft respectively to oscillate said rock shaft and to rotate said bender actuating shaft whereby the timing of the movements of the bender and feeding mechanism is accurately maintained.

12. In a blind stitch sewing machine mm prising a bed plate, a standard rising therefrom, an arm extending from the said standard over said bed plate and having a head carryinga curved oscillating needle and 'complemental stitch forming mechanism, a main shaft journaled in said arm and head and operatively connected to said stitch forming mechanism,'.a vertical shaft 'jour naled in said standard, means for rotating the same from the main shaft, feeding mechanism including a rock shaft located beneath said bed plate, adapted when oscillated to impart up and down cloth engaging and releasing movements to said feed dogfa bender actuating shaft located beneath said bed plate and means operable from said vertical shaft respectively to oscillate said rock shaft and to rotate said bender actuating shaft whereby the timing of the movements of the bender and feeding mechanism is accurately maintained, a second rock shaft located beneath said bed plate, means for actuating the same and means for causing the oscillation of said sec- 0nd rock shaft to advance and retract said dog. v

13. In a blind stitch sewing machine comprising a bed plate, a standard rising therefrom, an arm extending from the said stand ard over said bed plate and having a head carrying a curved oscillating needle and complemental stitch forming mechanism, a main shaft journaled in said arm and head and operatively connected to said stitch formingmechanism, a vertical shaft journaled in said standard,'means for rotating the same from the main shaft, feeding mechanism including a rock shaft located beneath said bed plate, means for causing the oscillation'of the same to impart up and down cloth engaging and releasing movements to said feed dog, a bender actuating shaftslocated beneath said bedplate and means operable from said vertical shaft respectively to oscillate said rock shaft and to rotate'said bender actuating shaft whereby the timing of the movements of the bender and feed-' ing mechanism is accurately maintained, a

second rock shaft located'b'eneath said bed plate and connected to said feed dog to cause the oscillation of said rock shaft to advance and. retract said dog,'means for actuating said rock shaft comprising a floating lever located in said standard and having a' fork engaging a cam upon the main shaft, means for su porting the fulcrum of said lever adjustab y toward and from the longitudinal axis of said lever whereby the amplitude of advancing and retracting movement of the feed dog may be regulated. p

14. In a blind stitch sewing machine comprising a bed plate, a standard rising therefrom, an arm having a head. carrying a curved-oscillating needle and complemental stitch forming mechanism, a main shaft journaled in said arm and head and operativelyconnected to said stitch forming mechanism, a vertical shaft mounted in said standard, means for rotating the same from the main shaft, feeding mechanism, rock shafts respectively operable to impart up' and downwork engaging and releasing V movements to said feed dog and to advance and'retract the same and a bender actuating shaftlocated beneath said bed plate, a gear having an eccentric stud upon "said vertical shaft, a companion gear upon said bender shaft meshing therewith, a link connecting said stud to an arm on the rock shaft operable to impart Work engaging and'releasing movement to said dog and means for oscillating the rock shaft which is operable to advance and retract said dog.

15. In a blind stitch sewing machine comprising a bed plate, a standard rising therefrom, an arm having a head carrying a curved oscillating needle and complemental stitch forming mechanism, a main shaft ]0urnaled 1n sald arm and head and opera-' able to impart work engaging and releasing movement to said dog and means for oscillating the rock shaft which 1s operable to advance and retract said dog comprising an eccentric on the main shaft and a floating lever having a yoke embracing said eccentric and connected at its opposite end to an arm 7 on said rock shaft and means for adjusting the movement of the fulcrum of said floating lever to control the extent of oscillation thereof.

16. In a sewing machine comprising a bed plate, an overhanding arm and head, a presser foot, a curved oscillating needle and complementary stitch forming mechanismcarried by said head, a work supporting member extending through an aperture in said bed plate in cooperative relation to said presser foot, a bracket depending from said bed plate, guides upon said work supporting member engaging ways upon said bracket, means for yieldably supporting said work supporting member from said bracket, rock shafts 'journaled at one end in said work supporting member means pivotally supporting the other ends of said rock shafts, a feed dog connected to and carried by said rock shafts, and means for oscillating said rock shafts to impart, up and down, forward and back, work engaging and releasing movements to said feed dog.

17. In a sewing machine comprising a bed plate, an overhanging arm and head, a

.presser foot, a curved oscillating needle and complementary stitch forming mechanism carried by said head, a work supporting member extending through an aperture in said bed plate in cooperative relation to said presser foot, a bracket depending from said bedplate, a helical spring adjustably supported by said bracket engaging said work supporting member, guides upon said work supporting member engaging ways upon said bracket, rock shafts journaled at one end in said work supporting 1nem ber, means pivotally supporting the other ends of said rock shafts, a feed dog connected to and carried by said rock shafts, and means for oscillating said rock shafts to impart, up and down, forward and back, work engaging and releasing movements to said feed dog.

In testimony whereof, I have signed my name to this specification.

THOMAS J. HAYES. 

